Add Bruno API collection for device cap management

- Update User Max Devices - Complete API documentation
- Update User Max Devices - Success test case
- Update User Max Devices - Invalid Zero test case
- Update User Max Devices - Exceeds Maximum test case
- Update User Max Devices - Missing ID test case
- Include validation rules and example payloads
- Document all status codes and error responses

bruno/user/admin/Update User Max Devices - Missing ID.bru

@@ -0,0 +1,27 @@
+meta {
+  name: Update User Max Devices - Missing ID
+  type: http
+  seq: 4
+}
+
+put {
+  url: {{base_url}}/api/auth/users//max-devices
+  body: {
+    max_devices: 10
+  }
+  auth: inherit
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Update User Max Devices - Missing User ID
+
+  Attempts to update max devices without providing user ID.
+
+  **Expected:** 400 Bad Request
+  **Response:** `{"error": "user id required"}`
+}